Window lock and alarm



Dec. 13, 1938. F. PIPER WINDOW LOCK AND ALARM Filed Sept. 11, 1937 2 Sheets-Sheet 1 Dec. 13, 1938. F. PIPER WINDOW LOCK AND ALARM 2 Sheets-Sheet 2 Filedsept. 11, i957 Patented Dec. 13, 1938 UNITED STAT-ss A'rsNT OFFICE Z Claims.

'I'his invention relates to a combined window lock-and alarm, the general object of the invention being to provide means for preventing the :sashes of a window being opfened from the exterior of a building and also to sound an alarm if an attempt is made to so open the sashes.

Another object of the invention is to provide lmeans whereby the device can be adjusted so that the sashes can be partly opened for ventilating purposes without yinterfering with the intended operation of the device.

The invention also consists in certain other features of construction, combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accom panying drawings and specifically pointed out in the appended claims. y

In describing the invention in detail, reference will be had to the accompanying drawings wherein like characters denote like or corresponding parts throughout the several views, and in which:

Fig. 1 is a fragmentary perspective view showing the invention in place ona window.

Fig. 2 is a longitudinal sectional new of the device.

Fig. 3'isa yside view of the housing with the channel member in section.

Fig. 4 is a front View with the housing in section, to show the interior parts.

Fig. 5 is a section on line 5 5 of Fig. 2.

Fig. 6 is a view of the sliding brake member.

Fig. "I is a View of the clapper member.

In these drawings, the numeral I indicates an elongated channel member having a longitudinal row of spaced transversely extending slots 2 in its bottom part, the flanges of the member being bent inwardly. This member is fastened to the inner face of a side rail of the upper sash, as shown in Fig. l. The numeral indicates a v housing, the inner edges of the sides of which are bent outwardly to form the flanges t which engage in the guideways formed by the bent anges of the member I. Thus the housing is slidingly supported by the member I and can be removed therefrom by lifting the housing upwardly through the upper end of the member I. The upper end of the housing has a catch forming projection 5 thereon for engaging any one of the slots 2, the housing having a loose fit in the channel member for enabling the housing to be lifted suiiciently to disengage the catch from one slot and then moved to place the catch in another slot. When the catch is engaging a slot the housing is held against sliding movement, and must be lifted to the position shown in Fig. 3 to free the catch from a slot before it can be moved either upwardly or downwardly.

The upper part of the housing is enlarged, as shown, and the lower part slopes downwardly and inwardly towards the sash and this lower part has a longitudinally extending slot 5 in its front wall. The bottom 'i of the housing is flat and is flush with the flanges Il. The sloping lower part of the housing forms a wedge which is engaged by the top of the lower sash, when either sash is moved'towards the other sash, to stop such movement, after the Vsash is moved a limited amount.

A shaft 8 is journalled in the side walls of ,t the enlarged part of thehousing and has one end extended to receive the handle part S. A spring motor lil is located in the housing and one end of the spring of the motor is connected with the shaft, so that by turning the shaft in one direction the spring will be wound. This motor rotates a toothed wheel Ii through means of apawl I2 and ratchet I3, as shown in Fig. 2, the wheel being supported by the shaft The wheel II meshes with a pinion I4 on a shaft I5, in the housing and said shaft carries .a wheel I6 having the projections I'I on its periphery, each projection having a straight front edge and a beveled rear edge, as shown in Fig. 2.

A brake member I8, shown in Fig. 6 in detail, is slidably arranged in the housing and is supported for sliding movement by the clips I9. The lower end of this member is bent at right angles to form the finger 20 which passes through the slot 6 and its upper end has an off-set projection 2i thereon for engaging the projections Il on the wheel I6 when the member i8 is in. lowered position. As shown in Fig. 2, when the member is in lowered position the straight side or edge of a projection Il will engage the part 2| and thus the wheel I6 is held against turning movement by the spring motor. However, when the member I8 is in raised position the part 2i is raised above the path of movement of the projections and the wheel I6 can be rotated from the spring motor. A clapper member 22, formed of a spring strip as shown in Fig. 7, is fastened at its lower end to the bottom of the housing, as shown at 23. The upper end of the member 22 is bent forwardly, as shown at 24 and terminates in a lip 25 for engagement by the projections I'l of the wheel I6. Adjacent the part 24 the strip is bowed outwardly as shown at 25. As 1 will be seen when the lip is engaged by a projection, the strip will be lifted until the lip frees itself from the projection and then the strip will snap back against the bottom of the housing and thus make a clapping noise. A spring 2l resiliently holds the member i3 in lowered position with its part 2| in the path of movement of the projections n the wheel l'o.

When the window is to be locked, the housing is placed in the channel member l and said housing is adjusted in the member to place the nger 2G adjacent the top rail of the lower sash as shown in Fig. i. This figure shows the two sashes entirely closed but if it is desired to have the sashes, or one sash, partly opened for ventilating purposes, the housing is adjusted in the channel member to a position where the iinger will be engaged by the lower sash if an attempt is made to open either sash to a greater extent. Of course the spring of the motor must be wound up by turning the shaft 8 by the handle member 9. Then if an attempt is made to move either sash, the nger 28 will be engaged by the tcp rail of the lower sash and this will slide the brake member I8 upwardly which will move the part 2| out of the path of the projections on the wheel I6 and then the wheel will be rotated from the spring motor. During this rotary movement of the wheel i6 the projections E7' thereon will engage the clapper member and alternately lift it and then release it so that the member striking the bottom oi' the casing will make a clapping noise and thus indicate to a person in the building that an attempt is being made to open the window. If the attempt continues a part of the housing will engage the top rail of the lower sash and this will prevent further opening movement of either sash.

rhus I have provided a simple device which will not only act as a sash lock but it will also sound an alarm to notify occupants of a building that an attempt is being made to enter the building.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent. Y

It is to be understood that changes may be made in the construction, combination and arrangement of the several parts, provided such changes fall within the scope of the appended claims.

What I claim and desire to protect by Letters Patent is:-

1. A device of the class described, comprising an elongated channel member attached to a side rail of an upper sash, the flanges of said channel member being turned inwardly, and said member having transverse slots therein, a housing having a anged base sliding in the channel member, a projection at the upper end of said base for engaging the slots for holding the housing in adjusted position, said flanged base having a loose fit in the channel member for enabling the projection to be moved out of a slot, said housing having a part for engagement by a part of a sash for preventing opening movement of either sash, and means carried by the housing and actuated by movement of either sash for sounding an alarm before movement of a sash is prevented by said part. Y

2. A device of the class described comprising an elongated channel member connected with a side rail of an upper sash and having its anges turned inwardly, said member having vertically spaced transverse slots therein, a housing having flanges engaging the flanges of the member for sliding movement, said housing being removable from the member, a catch on the housing for engaging the slots for holding the housing in adjusted position in the member, a spring motor in the housing, a member rotated by the motor and having projections thereon, a brake member slidably arranged in the housingyieldable means for holding the brake member against the rotary member, a finger on the brake member engaged 'by a part of a lower sash when either sash is moved towards open position, for releasing the rotary member from the brake member, a part of the housing engag- Y ing the lower sash after the brake member has been moved to releasing position, to stop further movement of either sash and a spring clapper member actuated by the projections on the rotary member when the member is rotating.

FREDERICK PIPER. 

